1 files changed, 10 insertions, 0 deletions
diff --git a/shaders/prebuilt/post.vert.glsl b/shaders/prebuilt/post.vert.glsl
new file mode 100644
index 00000000..86739a65
--- /dev/null
+++ b/shaders/prebuilt/post.vert.glsl
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+#version 450
+
+// A post pass (docs/render-pipeline.md §6): one fullscreen triangle from
+// gl_VertexIndex, no vertex buffer. The Shadertoy fragment shader works from
+// gl_FragCoord, y down, as its fragCoord.
+
+void main() {
+    vec2 p = vec2(float((gl_VertexIndex << 1) & 2), float(gl_VertexIndex & 2));
+    gl_Position = vec4(p * 2.0 - 1.0, 0.0, 1.0);
+}